21347995 has 16 divisors (see below), whose sum is σ = 27067392. Its totient is φ = 16138080.

The previous prime is 21347983. The next prime is 21348007. The reversal of 21347995 is 59974312.

It is an interprime number because it is at equal distance from previous prime (21347983) and next prime (21348007).

It is a de Polignac number, because none of the positive numbers 2^k-21347995 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5064 + ... + 8266.

It is an arithmetic number, because the mean of its divisors is an integer number (1691712).

Almost surely, 2^21347995 is an apocalyptic number.

21347995 is a deficient number, since it is larger than the sum of its proper divisors (5719397).

21347995 is a wasteful number, since it uses less digits than its factorization.

21347995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3282.

The product of its digits is 68040, while the sum is 40.

The square root of 21347995 is about 4620.3890528829. The cubic root of 21347995 is about 277.4080316396.

The spelling of 21347995 in words is "twenty-one million, three hundred forty-seven thousand, nine hundred ninety-five".